setup hold timing during post layout simulations using ncsim

[sami_1]

When doing post layout simulations, ncsim is given both sdf and library_model.v files. The library_model.v file has all the models + timings for the cells in the libraray. The default is 1ns for both setup and hold. When doing simulations using ncsim, are sdf values taken into acccount only and info in library_model.v discarded ? I need to find out how both the files are used and where do the setup hold timing requirements for the Flops come from during post layout simulations
Thanks

 

[anant]

all the timing related information is present in sdf file "Delays: module path, device, interconnect, and port Timing checks: setup, hold, recovery, skew, width, and period." when you do back annotation the timming information from sdf file is used.